[FFmpeg-devel] [RFC] Support dynamic loading of third-party libs

[Marc Giger]

Hi,

Attached is a preliminary patch that enables runtime loading of external
libraries via dlopen and friends. Dynamic loading is a build time option
(--enable-dynamic-loading) and if it is not activated the libs are
linked as usual (still no dependency to dlopen required).

The patch is intended as a basis for a discussion and therefore the
following applies:

- only libmp3lame and libva will by dynamically loaded atm
- only tested on linux atm
- deregistering not implemented (dlclose)
- versioning (which version of a lib should be loaded?)
- library usage counter missing
- ...?

What do you think?

Thanks,

Marc
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